As with cultivated crabapples, ornamental (and edible) pears are beginning to appear frequently in fields and roadsides. And as with crabapples, they are variable and difficult to identify. More collections are needed.
1. Styles 2–3; fruits ca. 6–11 mm in diameter, round; calyx lobes deciduous.
1. Styles 5; fruits larger, ca. 1.5–8 cm in diameter, often elongated, “pear-shaped” or ellipsoid; calyx lobes persistent on mature fruit (except in P. cordata).
2. Calyx lobes persistent in fruit; fruits ca. 3–8 in diameter, usually elongated (“pear-shaped” or ellipsoid); leaves with marginal cilia and pubescence on the midvein on the upper leaf surface (especially near apex) persistent most of the season.
2. Calyx lobes deciduous; fruits ca. 1.5–2 cm in diameter, round; leaves essentially glabrous on the upper surface and margins even at flowering time.
All species found in Pyrus
MICHIGAN FLORA ONLINE. A. A. Reznicek, E. G. Voss, & B. S. Walters. February 2011. University of Michigan. Web. December 14, 2017. http://michiganflora.net/genus.aspx?id=Pyrus.